Adds de-DE docs, installer wiring, and locale tests. Pre-validated on current main with install manifest checks, markdownlint, locale-install tests, and ECC 2.0 release-surface tests.
Refresh the active 2.0 release surface for the affaan-m/ECC repo identity, update package/plugin/workflow launch metadata, and add an operator command center for release video, partner, sponsor, consulting, and social launch execution.